Methods of providing walls with wear-resistant linings

ABSTRACT

A method and apparatus for providing a wall having holes in it at a first predetermined spacing with lining elements having fastening means positioned at a second predetermined spacing. Anchoring strips are bolted to the holes in the wall and connecting strips are attached to the anchoring strips. The connecting strips are mounted so that adjacent connecting strips are spaced from each other at the second predetermined spacing. The lining elements are attached to the connecting strips by means of the fastening means.

[limited States Patent [7 2]Inventor 130 K. G. Persson Trelleborg, Sweden [21] Appl. No. 778,555 [22] Filed Nov. 25, 1968 [45] Patented Aug. 17, 1971 [73 I Assignee Trelleborgs Gummifabrlks Aktiebolag Trelleborg, Sweden I 32] Priority Dec. 19, 1967 [33] Sweden [3 1 17401 /67 [5 4] METHODS OF PROVIDING WALLS WITH WEAR- RESISTANT LININGS 8 Claims, 3 Drawing Figs.

[52] U.S. Cl 220/63, 29/526 [51] llnt. C1 B23k 1/16, B23p 19/00 [50] Field of Search 29/526;

[56] References Cited UNITED STATES PATENTS 2,006,331 6/1935 Swearingen 220/63 2,148,427 2/1939 Howard et a]. 29/471.1 2,746,637 5/1956 Todd et a1 220/63 3,377,903 4/1968 Korte 29/526 X Primary Examiner.lohn F. Campbell Assistant Examiner-D. M. Heist Att0meyBeveridge & De Grandi ABSTRACT: A method and apparatus for providing a wall having holes in it at a first predetermined spacing with lining elements having fastening means positioned at a second predetermined spacing. Anchoring strips are bolted to the holes in the wall and connecting strips are attached to the anchoring strips. The connecting strips are mounted so that adjacent connecting strips are spaced from each other at the second predetermined spacing. The lining elements are attached to the connecting strips by means of the fastening means.

METHODS OF PROVIDING WALLS WITH WEAR- RESISTANT LININ GS The walls of drum or tube mills, chutes, screens, truck platforms and other constructions are often provided with a lining consisting of one or more plates or rods of wear-resistant material, particularly elastomeric material. When a wall earlier devoid of a lining is to be provided with such lining it is often difficult or impossible to mount fastening means for the lining at the locations on the wall most suitable for the lining. Where it is desired to pass over from one type of lining to another it is also mostly difficult or too expensive to mount fastening means on the wall at the locations most suitable for the new type of lining. Where for instance a cast iron mill end wall of considerable thickness of e.g. up to 150 mm. is concerned, it is very expensive to drill bolt holes in the wall which may often result in crack formation, apart from the fact that the wall is weakened.

The above difficulties are overcome by the present invention. To this end the invention relates to a method and apparatus for providing a wall, particularly the wall of a drum or tube mill, chute, screen or truck platform with a lining consisting of one or more plates or rods of wear-resistant material, particularly elastomeric material. Characteristic of the invention is that anchoring elements of suitable material, preferably metal, are anchored to the wall at spaced intervals by means of fastening devices provided on or in the wall. Connecting strips are then attached to the anchoring elements and a lining is attached to the connecting strips.

The invention thus makes it possible to have the anchorage points on the wall independent of those between the lining plates or rods and the anchoring elements so that one has a free choice, within broad limits, of localizing these different anchorage points and can arrange them in the most suitable manner with regard to the wall construction and the lining plates or rods, respectively.

For better elucidation, the invention will be more fully described in the following with reference to the accompanying drawings which illustrate some embodiments chosen by way of example.

In the drawings:

FIGS. 1 and 2 are a longitudinal and transverse section, respectively, of a drum mill which has been partly equipped with anchoring elements and connecting elements for the fixation of a wear-resistant lining;

FIG. 3 is a partial transverse section of a mill wall having mounted thereon.

A drum mill is illustrated in FIGS. 1 and 2. The circumferential wall 1 and end walls 2 of the mill are provided with a great many holes or first fastening means at a first predetermined spacing with respect to each other which earlier served to mount a lining having corresponding fastening means at the first predetermined spacing. It is now desired to mount a lining on the drum having fastening means spaced with respect to each other at a spacing different than the first predetermined spacing. In the embodiment chosen, the holes are arranged in three circular rows on the circumferential mill wall 1 and in two circular rows on each end wall 2. The holes are not arranged in a suitable number and in suitable positions for a direct fixation of the new type of lining to be built into the mill. To avoid making new holes in other positions the new type of lining is mounted in the following manner.

An annular anchoring element 3--5 of strip material, preferably metal, is manufactured for each circular row of holes in the walls 1, 2. Each annular member can be made in several sections to facilitate insertion thereof into the mill chamber. The anchoring strips 3-5 are provided with suitable fastening means for engagement of each fastening means in the existing holes in one row of such holes in the walls 1, 2. These fastening means are shown in FIGS. 1 and 2 in the form of stud bolts 6 attached to the strips 3-5 and traversing the holes in the walls 1, 2. At the outer ends the stud bolts carry nuts 7. Lining plates or rods can then be fastened in a suitable manner by the intermediary of connecting elements. At the top and to the left in FIG. 1 and at the top in FIG. 2 such connecting elements are shown in the form of strips 8 and 9 which extend at angles to the longitudinal directions of the anchoring elements 3-5. The connecting elements 8, 9 can be fastened to the anchoring elements 35 by welding, adhesive bonding, with the aid of screwsor bolts or fastening pins which are driven into the anchoring elements 35 by bolt setting gun, and lining plates or rodscan then be attached to said connecting elements in a suitable manner to be described in the following. The connecting elements arespaced-with a second predetermined spacing with respect to eachother which is different from the first predetermined spacing which the holes in wall 1 have. Lining elements which have fastening means spaced at said second predetermined spacing can then be attached to the connecting elements. Thus, it is seen that by controlling the spacing of the connecting elements, lining elements having fastening means spaced at any arbitrary spacing may be mounted to a wall having holes spaced at a predetermined spacing.

FIG. 3 shows the circumferential wall 1 of the mill, an annular anchoring element 3 and strip-shaped connecting elements 8. Welded to the anchoring element 3 is a stud bolt 6 which traverses a hole in the circumferential mill wall 1 and at the outer end has a nut 7 for clamping the anchoring element against the wall 1. The connecting elements 8 are welded to the anchoring element 3 so that they overlie anchoring elements 3. Lining plates 10 of elastomeric material are bonded to the connecting elements 8 by a suitable adhesive. In the embodiment illustrated in which the. plates 10 have fastening means (shown as grooves) for accommodating the connecting elements 8, the plates can also be bonded to the anchoring element 3. Bonded over the joint between the plates 10 is a rib 11 which serves as a lifter in the mill. Such lifter ribs 11 can also be bonded to the plates 10 between the joints thereof, as shown to the right in FIG. 3.

The lining plates or rods and the lifters can be made from a suitable wear-resistant material, preferably elastomeric material or manganese steel. With a lining of relatively soft elastomeric material it may sometimes be advantageous to arrange the strip-shaped connecting elements 8, 9 in such a way that their longitudinal direction makes an oblique angle with that of the strip-shaped anchoring elements 3-5, as this will have a sorting effect on the grinding elements in the mill by reason of the approximately helically extending support of the soft lining, provided by the connecting elements 8, 9. Instead of forming the anchoring elements 3-5 in the manner described as continuous strips which extend past a plurality of anchoring holes in the mill wall they can be formed as individual plates or like members each of which is fastened merely with the aid of one or a few fastening means to the mill wall.

Whatl claim and desire to secure by Letters Patent is:

l. A method of lining a vessel wall which has a plurality of bolt holes in it, said bolt holes having a first predetermined spacing with respect to each other, comprising the steps of,

attaching at least one anchoring strip to said wall by means of bolts extending through said bolt hole, attaching a plurality of connecting strips to said at least one anchoring strip so that said connecting strips cross over said at least one anchoring strip at a predetermined angle and so that adjacent connecting strips are at a second predetermined spacing with respect to each other different from said first predetermined spacing, and

attaching at least one lining element of a wearresistant material which has fastening means spaced with respect to each other at said second predetermined spacing to said connecting strips by fastening said fastening means to said connecting strips.

2. Method according to claim 1 wherein said wall in a curved wall of a drum mill, said holes being arranged in parallel rows around the curvature of said wall and wherein adv jacent holes within each row are at said first predetermined spacing with respect to each other 3. Method according to claim 2 wherein said predetermined angle is an oblique angle.

4. Method according to claim 2 wherein said predetermined angle is 90,

5. A vessel with a wall having a plurality of first fastening means which have a first predetermined spacing with respect to each other,

at least one anchoring strip attached to said wall by means of said first fastening means,

a plurality of connecting strips attached to said at least one anchoring strip and crossing over said at least one anchoring strip at a predetermined angle, adjacent connecting strips being spaced from each other at a second predetermined spacing different from said first predetermined spacing, and at least one lining element of a wear-resistant material having second fastening means spaced from each other at said second predetermined spacing being attached to said 5 connecting strips by means of said second fastening means. 6. The vessel of claim 5 wherein said wall is a curved wall of a drum mill, said first fastening means being arranged in parallel rows around the curvature of said wall and wherein adjacent fastening means within each row are at said first predetermined spacing with respect to each other.

7. The vessel of claim 6 wherein said predetermined angle is an oblique angle.

8. The vessel of claim 6 wherein said predetermined angle is 90. 

1. A method of lining a vessel wall which has a plurality of bolt holes in it, said bolt holes having a first predetermined spacing with respect to each other, comprising the steps of, attaching at least one anchoring strip to said wall by means of bolts extending through said bolt hole, attaching a plurality of connecting strips to said at least one anchoring strip so that said connecting strips cross over said at least one anchoring strip at a predetermined angle and so that adjacent connecting strips are at a second predetermined spacing with respect to each other different from said first predetermined spacing, and attaching at least one lining element of a wear-resistant material which has fastening means spaced with respect to each other at said second predetermined spacing to said connecting strips by fastening said fastening means to said connecting strips.
 2. Method according to claim 1 wherein said wall in a curved wall of a drum mill, said holes being arranged in parallel rows around the curvature of said wall and wherein adjacent holes within each row are at said first predetermined spacing with respect to each other.
 3. Method according to claim 2 wherein said predetermined angle is an oblique angle.
 4. Method according to claim 2 wherein said predetermined angle is 90*,
 5. A vessel with a wall having a plurality of first fastening means which have a first predetermined spacing with respect to each other, at least one anchoring strip attached to said wall by means of said first fastening means, a plurality of connecting strips attached to said at least one anchoring strip and crossing over said at least one anchoring strip at a predetermined angle, adjacent connecting strips being spaced from each other at a second predetermined spacing different from said first predetermined spacing, and at least one lining element of a wear-resistant material having second fastening means spaced from each other at said second predetermined spacing being attached to said connecting strips by means of said second fastening means.
 6. The vessel of claim 5 wherein said wall is a curved wall of a drum mill, said first fastening means being arranged in parallel rows around the curvature of said wall and wherein adjacent fastening means within each row are at said first predetermined spacing with respect to each other.
 7. The vessel of claim 6 wherein said predetermined angle is an oblique angle.
 8. The vessel of claim 6 wherein said predetermined angle is 90*. 